Characterization of dielectric elastomer actuators based on a hyperelastic film model

The focus of this paper is on the energy characterization of dielectric elastomer (DE) actuators under quasi-static activation cycles. To this end, a simple model covering the basic mechanical effects of hyperelastic dielectric elastomer films was introduced and fitted to the experimental behavior of the widely used dielectric film VHB 4910 in a uniaxial tensile test. The film model was then applied to planar DE actuators by introducing the electromechanical coupling of the electrodes to the film. The evaluation of this system permitted the characterization of the inner force equilibrium states of planar DE actuators under activation with either constant charge or constant voltage. In a second step, a quasi-static activation cycle of an idealized DE strip actuator with uniaxial prestrain was simulated. The configuration was evaluated regarding the characteristics of the specific work output per cycle as well as the overall electromechanical efficiency for various activation voltage levels and different prestrain levels.

[1]  Jae Wook Jeon,et al.  Multiple degree-of-freedom digital soft actuator for robotic applications , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[2]  R. Kornbluh.  Dielectric Elastomer Artificial Muscle For Actuation, Sensing, Generation, And Intelligent Structures , 2004 .

[3]  Q. Pei,et al.  High-speed electrically actuated elastomers with strain greater than 100% , 2000, Science.

[4]  O. Yeoh.  Some Forms of the Strain Energy Function for Rubber , 1993 .

[5]  Edoardo Mazza,et al.  Modeling and simulation of dielectric elastomer actuators , 2005 .

[6]  Eric Mockensturm,et al.  Electro-elastic modeling of a dielectric elastomer diaphragm for a prosthetic blood pump , 2004, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[7]  D. De Rossi,et al.  Electromechanical characterisation of dielectric elastomer planar actuators: comparative evaluation of different electrode materials and different counterloads , 2003 .

[8]  Jaedo Nam,et al.  Actuator model of electrostrictive polymers (EPs) for microactuators , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[9]  Eric Mockensturm,et al.  Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[10]  Ron Pelrine,et al.  Dielectric elastomers: generator mode fundamentals and applications , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Yoseph Bar-Cohen,et al.  Actuation of biologically inspired intelligent robotics using artificial muscles , 2003, Ind. Robot.

[12]  M. Mooney.  A Theory of Large Elastic Deformation , 1940 .

[13]  Yoseph Bar-Cohen,et al.  Electrostatically stricted polymers (ESSP) , 1999, Smart Structures.

[14]  R. Pelrine,et al.  Actuation Response of Polyacrylate Dielectric Elastomers , 2003 .

[15]  Ron Pelrine,et al.  Ultrahigh strain response of field-actuated elastomeric polymers , 2000, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[16]  Jae Wook Jeon,et al.  Soft actuator for robotic applications based on dielectric elastomer: dynamic analysis and applications , 2002, Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292).

[17]  O. H. Yeoh,et al.  Characterization of Elastic Properties of Carbon-Black-Filled Rubber Vulcanizates , 1990 .

[18]  Richard Heydt,et al.  Applications of dielectric elastomer actuators , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[19]  Edoardo Mazza,et al.  Modeling of a pre-strained circular actuator made of dielectric elastomers , 2005 .

[20]  R. Pelrine,et al.  Electrostriction of polymer dielectrics with compliant electrodes as a means of actuation , 1998 .

[21]  Yoseph Bar-Cohen,et al.  Flexible low-mass devices and mechanisms actuated by electroactive polymers , 1999, Smart Structures.

[22]  Ron Pelrine,et al.  Multifunctional electroelastomer rolls and their application for biomimetic walking robots , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[23]  Robert J. Full,et al.  Muscle-like actuators? A comparison between three electroactive polymers , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[24]  Danilo De Rossi,et al.  High-strain dielectric elastomer for actuation , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[25]  Q. Pei,et al.  Electroelastomer rolls and their application for biomimetic walking robots , 2003 .

[26]  R. Ogden.  Large deformation isotropic elasticity – on the correlation of theory and experiment for incompressible rubberlike solids , 1972, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[27]  Q. Pei,et al.  High-field deformation of elastomeric dielectrics for actuators , 2000 .

[28]  Peter Sommer-Larsen,et al.  Silicone dielectric elastomer actuators: Finite-elasticity model of actuation , 2005 .